“Knowing where to begin describing these is hard. The closest I can come is my first experience listening to a pair of full-size swiss Piega loudspeakers back in the early '90s. The resolution of those things was so incredible I thought that they reproduced the notes of a double-bass with such amazing resoultion you could hear the detail of the strings vibrating and that's before you get an idea...” --Currawong

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Headphones simply do not get better than this. The first time I heard the O2 mk1 was at the First National Meet. I was blown away. I had no idea that headphones could sound like...that. They simply melted away. It some ways, they ruined that meet for me because they were among the first phones I heard.
Fast forward a few years and a few meets later and I decided that I had...” --The Monkey

“After the great reviews by John and Ed, there is really not much to say.
The 009 is to my ears, a perfect headphone, although at times in the brighter side. In spite the 009's however, I frequently grab the Sigmas/404 for chamber music, vocals and chorales.
The bass can at times get a little boomy in complex orchestral passages, but the wonderful mids give piano, voices and small...” --gilency

“So, you were researching this headphone...and wondered: "Should I go for it?"
Do you like acoustic, vocal or classical music?
Well, if you do, firstly, I would say you should probably pull the trigger before someone else does. And then you may continue reading this - in a more relaxed matter :)
You should pay attention the condition though, some of...” --padam

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I got this headphone second hand and have used this headphone for about 4 months now. I've used it with the Stax SRM-T1W, with a CI Audio VDA2/VAC1 as source. I'm really happy with the 4070. It provides the most detailed neutral sound I've heard yet. It truly allows you to hear everything that is in the recording. With some music this is just perfect, mostly with classical and the older...” --paaj

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originally posted on Headphiles (www.headphiles.org) on November 7, 2010
these are my impressions on the stax sr-lambda pro + stax srm-1 / mk2 combo. as always, YMMV!
why stax?
i always felt these were at the pinnacle of the headphone chain. head-fi and poisonous impressions from acquaintances here at headphiles have all added to that longing for a personal...” --maruzen

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This is my first foray into the electrostatic world and won't be my last. Everything that has been written in the past about Stax is borne true in listening to these phones.
Liquid mid's, shimmering treble and a suprising amount of deep, strong bass.
Even though described as portable I would not go outside with these. They are my in the house set up as they offer little or no...” --ianmedium

“I had it for about 6 months now I think. The version I have seems to date to 2005. YMMV depending on when your model was made so be warned especially if you want to buy a new pair. Your ears will also vary . You may find them too bright (but say not as bright as Sony MDR-CD3000 or MDR-EX700 ). For the pair I have - I either don't hear the magical etch, or it's not there in the pair I have....” --svyr

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(The following is a completely rewritten review dated October 24, 2010, and replaces the previous one written back on May 30, 2010)
I’ve been hearing about electrostatic headphones for a while now, and they are usually spoken about with reverence since some of the finest and most expensive headphones ever made were elecstrostatic. Stax is currently the king of electrostatic...” --Lunatique